A
1
B
0
C
- 2
D
2cosθ
উত্তরের বিবরণ
সমাধান:
দেওয়া আছে,
tanθ = 1
বা, sinθ/cosθ = 1
∴ sinθ = cosθ
এখন,
sinθ - cosθ
= cosθ - cosθ
= 0
0
Updated: 1 day ago
sinx = 3/4 হলে, tanx এর মান কত ?
Created: 1 day ago
A
3/√7
B
5/4
C
√7/4
D
4/3
সমাধান:
আমরা জানি,
sin2x + cos2x = 1
cos2x = 1 - sin2x
= 1 - (3/4)2
= 1 - (9/16)
= (16 - 9)/16
= 7/16
∴ cosx = √7/4
এখন,
tanx = sinx/cosx
= (3/4)/(√7/4)
= (3/4) × (4/√7)
∴ tanx = 3/√7
0
Updated: 1 day ago
secA + tanA = 7/3 হলে, secA - tanA=?
Created: 1 day ago
A
4/3
B
1/3
C
3/7
D
3/4
সমাধান:
আমরা জানি,
sec2A - tan2A = 1
⇒ (secA - tanA)(secA + tanA) = 1
⇒ (7/3)(secA + tanA) = 1
⇒ (secA + tanA) = 1/(7/3)
⇒ (secA + tanA) = 3/7
0
Updated: 1 day ago
A = 45° হলে, (1 - tan2A)/(1 + tan2A) = কত?
Created: 2 days ago
A
1/2
B
2
C
1
D
0
সমাধান:
(1 - tan2A)/(1 + tan2A)
= {1 - (tan45°)2}/{1 + (tan45°)2}
= {1 - (1)2}/{1 + (1)2}
= (1 - 1)/(1 + 1)
= 0/2
= 0
0
Updated: 2 days ago
